Panggabean, B. D., & Putra, A. Y. U. (2026). ANALYSIS OF NATURAL UNDERGROUND TUNNEL BASED ON ROCK MASS RATING CLASSIFICATION IN TASANGKA AREA, JAYAPURA CITY. INTAN Jurnal Penelitian Tambang, 9(2), 59–68. https://doi.org/10.56139/intan.v9i2.460